Recoil-operated firearm



lNn Model.) 3 Sheets-Sheet 2.

R. M. GATLIN. RBGOIL OPERATED PIREARM.

Patented Deo. 29

krt. il Il (No Model.) 3 sheets-sheet 3.

R. M. GATLIN.

RE'GOIL OPBRATED FIREARM.

No, 574,350. Patented 1360.29, 1896.

.hun

UNiTEn STATES PATENT OFFICE.

ROBERT M. CATLIN, OF TUSCARORA, NEVADA, ASSIGNOR TO 'lIlIl SAN FRANCISCO ARMS COMPANY. OF SA FRANCISCO, CALIFORNIA.

RECOlL-OPERATED FIREARIVI.

SPECIFICATION forming part of Letters Patent No. 574,350, dated December 29, 1896.

Application filed September 20, 1894. Serial No. 523,602. No modell To @ZZ whom it may concern:

Be it known that I, ROBERT M. (.EATLIEX a citizen of the United States, residing at 'luscarora, county of Elko, and State of Nevada, have invented certain new and useful Improvements in Recoil-Operated Firearms, fully described and represented in the fol; lowing specification and the accompanying drawings, forming a part of the same. y

The object of the present invention is to provide an improved magazine-firearm, and especially' to provide an ilnproved construction of firearm of that particular class known as recoil-operated,in which the energy developed bythe recoil is utilized in retraeting the b1eecl1-bolt from ldie barrel to open the brocoli and performing the other operations required for the next discharge. The invention is intended especially for use in shoulder-arms, either rilles or Shotguns, but itis applicable also to all other classes of firearms, including light and heavy guns.

rlhe present invention relates especially t-o firearms employing,` a longitudinally-movable barrel and a breech-bolt connected tothe barrel by a pair of links pivoted together, with means for returning the barrel to position after recoil and actuating the links to withdraw the breech-boltand open the breech and for returning the brocoli-bolt to normal position, the breech-bolt preferably being withdrawn during the return movement of the barrel.

The especial object of the invention is to provide an improved breech movement of this class; and the invention includes various features of construction and combinations of partsin a firearm of this general organization and certain specific features combined with the breech movement to form a complete firearm, some of which may be applied also in otherclasses of firearms employing a different breech movement.

In the construction embodying the various features of the invention in their preferred form I use a breech movement. in which the links are open and lie substantially in a straight line in their normal position and are .locked in such position during the recoil movement, so as to lock the breech-bolt to the barrel while the links are unlocked for I the .return movement of the barrel, and during this return moveinentthe link connected to th'ebarrel is operated as a lever to retract the breech-bolt and open the breech, the breech-bolt being released at the proper time and returned to position by the opening or straightening of the links and the empty shell being meanwhile ejected and the live cartridge inserted and carried into the barrel by the returning breech-bolt.

For a full.understanding of the invention a detailed description of a construction of th'is general organization embodying all the improvements as applied in their preferred form will now be given in connection with the accompanying drawings, forming a part of this speeitication, and the features forming the invention will then he speeiieallypointcd out in the claims.

Referring to the drawings, Figure l is a longitudinal vertical section of the breech portion of the gun, taken on line l of Fig. 5, the gun being shown as loaded with the hammer resting upon the .firing-pin. Fig. 2 is an enlarged central section showing the same position. Fig. 3 is a view similar to Fig. E?, showingthe parts in the position they occupy after the recoil with the barrel in its rearward position. Fig. -t is a similar view showing the barrel returned to its normal position and the breech-bolt fully withdrawn and about to be returned to position to carry the cartridge from the carrier into the barrel and close the breech. Fig. 5 is a longitudinal horizontal section on the line 5 of Fig. 2. Figs. and 7 are cross-sections on, respectively, the lines G 7 of Fig. 2. Fig. S is a detail side view of the barrel-extension and links.

In the drawings-A is the barrel ,-B, the magazine below the barrel; C, the frame in which the barrel and magazine are mounted and in which the operatingparts of the gun are carried-5 D,the t'ore-arlnf; E,the butt orstock of the gun; F, the breech-bolt; G, the barrel extension, inelosing the breech-bolt and formed integral with or rigidly con neeted to the barrel so as to form a part thereof, being shown as screwed thereto; ll, the hammer; I, the firing-pin; K, the hand-lever, and L the carrier.

The barrel A with its rearward extension G are free to move longitudinally for a limited distance independently of the frame C and magazine B, and the magazine lB maybe supported at its forward end from the barrel, as usual, by rings carried by the barrel and sliding on the magazine or in any other suitable manner, the barrel and barrel extension sliding in the frame C, which is t'ormed'so asV to guide and hold them against turning, the guiding-surfaces being preferably angular, as shown, a tongue and groove being used.

'lhebreech-bolt F reciprocates in the barrelextcnsion G, and the latter is mortised vertieall y the length of a cartridge,.as shown at l0, and this inortise registers with similar mortises in the frame C above and below the barrel extension, the mortise below the breech-piece communicating with the rea-r end of the magazine B and containing a movable Ycarrier L, and the empty cartridge-shell being ejected from the top of the gun through the mortise 1l' in the frame, as usual in such col'istructions, the breech-bolt being provided with an extractor 12 of any suitable form for withdrawing' the shell from the barrel as the breech-bolt is retracted. The magazine may be filled from its rear end in the usual manner, as through an opening in the side of the frame C,and is provided with the usual springfollower lf3 for moving the cartridge rearward.

'lhe barrel A and barrel extension G are held in their normal forward position, as

this spring 14: being compressed by the recoil l and reacting` to return the barrel and barrel t extension to normal position. This loose eonnection between the rod a' and barrel cxten- 1 sion is preferred, as it permits these two parts to be separated in taking the gun apart.

The breech-bolt F is connected to the barrel extension Gby a pairof links (L Z), pivoted together, the forward end ot' the front link d being pivoted to the l'neech-bolt F and the rear end of the rear link t) t`o the barrel extension G. The front link r1 is shown witha single bearing-surface at its forward end, but at its rear end knuckle-joints with the two side plates, by which the link l is t'ornied in the construction shown. lt will be understood, however, that these links may be constructed in any other suitable manner. 1

'lhe two side plates forming the link t) are provided with grooves l, forming a slot in which worksa pincarried b va lever 1S, having the pivot l.' at the base, of the frame t. 'l'his lever la carries` a lug i3, which is adapted to beengaged bya catch l onat'attl1-a1m 20, so

as to hohl the lever 1S and pin 2 during the return movementl of the barrel, the rear link I) thus forming a lever having its fulcrnm on the. pin L and being rocked thereon by the re turning barrel, so as to carry its forward end downward and rearward, thus retraeti ng the breech-bolt to open the breech. The handlever K operates' the lever lS to open the breech, being provided with a shoulder t0, which engages a l'ug'tl, carried by the lever Any suitable'construction for the lever 1S and catch-arm 20 may be used, but in the construction shown the lever 1S is formed of two side plates and between which the lug 3 is carried, and the catch-arm 2O passes between these plates.

The lever 1S is normally held in a vertical position, as shown in Figs. l and 2, by the strong [lat spring 2l, engaging a roll 22 on the rear side ofthe lever, and in that position the pin is in the central horizontal portion of the contact with the shoulders formed on the bar'- rel extension G, as shown in Fig. 7, the spring place against the barrel'extension. By this constzructiomtherefore,the links e Z) are locked against downward or closing movement in the normal position of the parts and during the recoil movement of the barrel, the breech-bolt F being thus securely locked to the barrel Vextension G and barrel, so thatthe full force of the recoil is transmitted from the breech-bolt i through the links Cz Z) to the barrel extension,y t

G and through the rod .1: to the spring 1t. t During this recoil movement, however, the t lever 18 is rotated on its pivot lt), so as to carry the pin 2 tothe position Vshown in Fig. 3, and at the yend of this movement the catch 4 on the catch-arm 20, depressed by itsY spring 22, engages the lug 8 on the lever 1S, so as to hold 'lhe recoihpressure may` be transmitted from the breech-bolt F to the barrel extension G and barrel wholly through the links'and pivot connecting th'ein, but l prefer to trans m it this pressure wholly or partially by means independent of this pivot and the rear link, i and in the preferred construction shown I attain this result. by providing the forward 'link u. with a pressure lug or lugs 42, a`lug at the l link b, as stated above.

: rear end of each fork of the link beingshown, is forked and forms two i these lugs being shown as of substantially tr1 l angular forni with a shoulder at therear end i and enterin g correspond ingly-shaped recesses i on the opposite sidewalls of the barrel exten` sion G, so as to engage corresponding lugs 4S on the barrel extension Aformed by the shoul- 5 ders at the rear end of the recesses, the engaging surfaces ofthe lugs 42 t3 being eut on such a curve as to permit the breaking down and return to position of the links. By thisconstruetion the recoil-pressure upon the t i t c breech-bolt F is transmitted to the barrel ex- 1S when the handlever is thrown forward."

slotl, so that the link Z) cannot rotate down-V ward, and itis held from rotating upward. by

2l pressing upward, so as to hold it rmly in 11o the latter, and, through the pin 2, therear 'center of the gun.

tension G partially,through the lugs 4;. 425, tion t3 and notch 5 being so formed that the thus reducing the pressure required to be transmitted bythe pivot connecting the links and by the rear link t). r1`he links may thus be made of smaller size and thickness than otherwise, while vsecuring the requisite strength. 'lhis is an important feature in that itadmits ot' a material reduction in the size and width of the barrel extension, and consequently of the frame of the gun.

/It will be understood ,that these lugs may be formed in any-other manner and placed in any other position suitt.

able for securing the 'result desired.

rI'he carrier I. is carriedby the carrier-arm i 2), pivoted coueentrically with the lever 1S, this carrier-arm being provided with the forward and rear projections 2t 25, by which the rear end of the link t) actuates the carrier, and slotted or formed of side plates to permit the passage of the lever 18 and spring 21 in the rl`he carrier L has the spring-wings Y, between which the cartridge is received and by which it. is held when carried upward, and below the carrier is the spring-pressed dog 20, of any suitable construction, for holding the cartridges in the magazine during the operation of the carrier, this dog being shpwn as pivoted a/nd springpressed upward .by a coiled springseated in the frame under it, the carrier pressing the dog downward las it descends. lhe catcharm 20 is extended forward sufficiently and is constructed to lie in the path of the carrierarm 23 as the latter rises, and the arm is thus raised to trip the catch -t ott? the lug S for the return of the,brecchbolt. The bolt I1` preterably carries al roller l 5, which lies between the wings? and forms a stop for the cartridge as it is fed rearward from the magazine into the carrier. f

the hammer and sliding in a block 29, pivoted in the plates It?. As shown, the hammer is partially cocked by the firing-pin during the recoil rmovement of the barrel and fully "cocked by a shoulder on the tiring-pin as the breech-boltl is fully retracted. It w-ill be understood, however, that the parts may be so constructed andarranged that the hammer will be brought to full-cock by the'recoil movement of the barrel, this depending upon the anglethrough which the hammer is constructed to move. l

'It is important that some safety 'device should be provided to prevent the tiring ofthe gun exceptwhen the parts are fully returned to their normal position, and in the construction shown the tiring-pin I and link o are so constructed as to coact and form a safety device, which is preferably used and in itself forms a part ot' the invention, although itwill be understood that it ma)7 he omitted. In this construction the tiring-pin I is provided with a curved notch 5 on its under side, in

tiring-pin is locked when the link c is broken down, and can be advanced only when the link H is fully returned to normal position and the links straightened out, so that the breech-bolt is locked securely. 'lhe action of this safety device will be understood from an examination of thc drawings, Fig. 1t showing the firing-pin locked against movement and the other figures showing the normal position ofthe parts.

Anysnitable construction of scar and trigger mechanism may be used, but that shown in Fig. 1.

will be found simple. and efticient. In this ctmstrnction the trigger Il() is split to accommodate the spring 2l, and rotates on the pivot 51 of the catch-arm it). 'lhe scar 32 rotates on the same center and is slot ted to admitthe pawl 33, pivoted thereon and spring-pressed bythe spring -t, and by which the scar is held against the hammer, 13.3 being the triggerspring. \\'hen the hammer is cocked, the scar engages a notch therein and the pawl 32) takes a position above a projection t) on the topof the trigger. On pulling the trigger the projection t) engages the lower end ot the pawl Si) and raises it, rotating the scar 32 against the'pressure of the spring St, thus disengaging the hammer, and as the hammer falls a lug 3o thereon wipes the pawl 33 ott the projection t), leaving the scar 32 free to engage thehammer-notch agai1r,even though the trigger remain in its rear position.

The gun is preferably constructed so that it maybe separated into two parts, as is usual with present shotguns, but it will be understood that this is not essential. In the construction shown the frame C is in three pieces c 5103, the barrel A, magazine 13, breech-bolt y f I?, barrel extension G, tiring-pin I, and the `The hammer-spring is shown as consisting of a coiled spring 2T on a rod 2S, pivoted toL links U. t) being in the part c, which may be separated from the parts of the frame c? ci" and the stock, which is secured to the latter,

the dividing line being on the dotted line y;

'lhe separation of the parts is effected by removing the fore-arm D, which is IOO fastened to the magaxine l by any suitable means, such as a. spring-catch, as usual, thiscatch not being shown, as it may be any wellknown construction; ,then pressing down the spring-catch il?, so that the clamping-strap 3s may be rotated rearward about its axis 8l. 'lhe whole forward part of the gun can then be rotated about the pin Btl in the part c? asa center until the band at the forward end of the part c' is freed from the pin t), the barrel extension G coming off the knuckle 1T and the pin 2 being drawn out of the slotl l in the link t, which is open at its lower end for this purpose. In connecting -the gun the operation is reversed, the slot l in the link b being introduced onto the pin 2 and the groove in the barrel extension over the. knuckle '1T as the parts are brought into position, and the parts secured togethtn' by returning the which a curved shouldered projection t5 on i clamping-strap 35 to the position shown in the front end of the link u takes, the project thedra\\'ings.whereit issecured bythesprulgcatch 87. The pin 2 may be moved by the hand-lever K into proper position to enter the slot 1.

Assuming that the parts are in the position shown in Figs. 1 and 2, except that the gun is cocked, pressure is applied to the trigger 30, so as to raise the sear from the notch in the hammer by engagement of the projection 9 with the lower end of the pawl 33, thus releasing the hammer and allowing it to strike the firing-pin and explode the cartridge. As soon as the explosion takes place the force of the recoil will cause the breech-bolt F, with the barrel extension G and the barrel A, to recoil against the tension of spring 14 and compress the same. The extent of the rearward movement of the barrel will depend upon the strength of the spring, the size of the charge, and the length of the cartridge, and may be adjusted as desired within the limits embraced by the available recoil-power, but a comparatively small movement of the barrel will be found sufficien t. and breech-bolt bot-h move rearward, the links a b are held pressed upward against t-he barrel extension G by the spring 21 acting on the lever18 and pin 2 in the slot 1, and the breechbolt is thus held locked to theA barrel until the latter is at or near the limit of its rearward movement, thus utilizing the full force of the recoil and preventing the escape of gases at the breech. The position of the parts with the barrel in its rear position is shown in Fig. 23.

The effect of the recoil having been spent,

the barrel returns to normal position under the pressure of spring 14, acting through the rod 0c, and the lever 1S being held by the catch -l the rear link is rotated downward on the pin 2 as a pivot by the forwardly-mmiing barrel extension to which the rear end of this link is pivoted, and thus draws backward the breech-bolt by the forward link a acting as a connecting link between the forward end of the rear link I), now acting as a lever, and the breech-bolt is fully retracted to open the breech. As the knuckle at the joints of the links a ZJ swings downward and rearward it engages the projection '25 at the rear end of the carrier-arm 23 and throws the carrier upward, so as to carry a cartridge in front of the breech-bolt, the empty shell, if any, being forced out at the top mortise 11 by 'the carrier as it rises, the ejector l2 having withdrawn the shell from the barrel with the breech-bolt. The position of the parts with the breech fully opened and a cartridge in position to be carried int-o the barrel by the breech-bolt is shown in Fig. l. The spring 2l has been compressed by the rearward movement of the lever 18, and the carrier-arm 23 in its upward movement to deliver the cartridge strikes the forward'end of the catcharm 20 and raises it so as to release the hook i from the lug 3 on the lever 18, when the spring 21, acting upon the roll22 on the lever 1b', rocks the latter forward and moves it from the position shown in Fig. 4 to that shown in -tends to move the carrier downward.

Asthe barrel vbetween the wings Zinto the'earrier.

Fig. :3, thus returning the links andpbreechbolt to their\normal positions and closing the breech. As the breech-bolt returns to position it passes between the wings l on the carrier L, opening them at the same time that it forces the cartridge into the barrel, and this movement also, by the pressure of thebreech-bolt upon the wings of the earrir, s the links are returned to their normal position, also, the striking of the knuckle at the joint between the links (t ZJ upon the front projection 24 of the carrier assures the return of the latter after the cartridge has been pushed into the barrel sufficiently by the breech-bolt so that it requires no further guiding from the carrier. As the carrier reaches its lowest position it forces downward the dog 26, which has sprung y,up when released bythe carrier, and thus releases the next cartridge, so that upon the withdrawal of the breech-bolt, it will be moved rearward The wings Z are shaped, as shown, to permit the magazine to be loaded from the side of the gun.

. The hammer has been partially cocked by the end of the tiring-pin as the barrel recoils and fully cocked as the breech-bolt is withdrawn from the barrel. As the hammer falls in firing the shot, the lug 36 on the hammer strikes the pawl 33 and wipes it off the projection .l,'so that the sear is free to catch the hammer as it is cocked, and the parts are now in position for firing another shot. If an automatic gun be desired, by which the entire contents of the magazine may be fired at one pull of the trigger, it is necessary only to omit the lug 3G on the hammer, when the sear will be held out of position to engage the hammer as long as the trigger is held back,`or it is obvious that adjustable means may be used, so that the gun may be either a single-ring or automatic gun.

l-Vhen the gun is to be loaded by hand, the hand-lever K is thrown forward from the position shown in full lines in the figures to that shown in dotted lines in Fig. 2, and the shoulder 40 on the hand-lever strikes the lug 41 on the Alever 18 and breaks down the links a I), carrying the link l) downward and backward, thus drawing the breech-bolt back by closing the links together, as shown in Fig. 4, and cocking-the hammer by the firing-pin, and on reversing the lever the parts are returned to their normal positions, as shown in Figs. 1 and 2, by the spring 21, the carrier being actuated as in the automatic operation of the gun, previously described. v

If the magazine is not to be used, it will be understood that the gun may be loaded by inserting a cartridge into the carrier from the rear through an opening in the side of the frame C, as usual in magazine-guns, prior 'to withdrawing the breech-bolt, or the cartridge may be inserted from the top of the gun when the breech-bolt is fully withd rawn.

IOO

IIO

It will be understood that the invention lmay be applied to gunsV of 'other generalconstruction than that shown, and that itmay be embodied in devices of widely-different forms. Theinvention therefore is not to be limited to the particular arrangement and 'and barrel, means for returning the barrel to position after recoil, a catch and connections between said catch and one of the links, whereby said link is actuated as a lever by the returning barreltofwithdraw the breechbolt and open the breech, acarrier tripping said catch, and means for returning-l the breech-bolt to normal position, substantially as described.

2. The combination with a longitudinallymovable barrel actuated by the recoil, of a breech-bolt, links connecting said breech-bolt' and barrel, a sprin g put under tension by the recoil of the barrel and by which the barrel is returned to normal position, mechanism operated by said spring for actuating the lin ks to withdraw the breech-bolt and open the breech, and-a spring put under tension by,

the withdrawal of the breech-bolt and reacting upon the links to return the breech-bolt to normal postion,substantially as described.

3. The combination Witha longitudinallymovable barrel actuated by the recoil, of a breech-bolt, links connecting said breech-bolt and barrel, means for returning the barrel to normal position, a catch and connections bctween said catch and the rear link between its points of connection to the other link and the barrel for holding said link by the catch,

vwhereby the rear link is actuated as a lever during the returnmovement of the barrel t0 withdraw the breech-bolt, means for tripping said catch for the return of the breech-bolt,

i and a spring put under tension by the withdrawal of the breech-bolt and actuating the links to return the breech-bolt to normal position, substantially as described.

4. The combination with a longitudinallymovablc barrel actuated by the recoil, of a breech-bolt, links connecting said breech-bolt and barrel, means for returning the barrel to normal position, a catch acting during the return of the barrel and .tripped for the return of the breech-bolt, a member having a sliding connection with the rear link, and devices whereby said member is held by the catch during the return movement of the barrel and actuated on the tripping ol.' the catch to return the breech-bolt to normal position, substantially as described.

5. The combination with a longitudinallymovable barrel actuated by the recoil, of a breech-bolt, links connecting said breech-bolt and barrel, means for returning the barrel to normal position, a cal ch acting during the return of the barrel and tripped for the return oi' the breech-bolt, a member having a pinand-slot connection with the rear link, said slot being formed to lock the links in their normal position for the ret-oil movement, and devices whereby said member is hezd. by the catch during the return movement ol' the barrel and actuated on the tripping of the catch to return the breech-bolt to normalposition, substantial] y as described.

G. The combination with a longitudinally-- movable barrel, actuated bythe recoil of a breech-bolt, links connecting said breech-bolt and barrel, means vfor returning the barrel and breech-bolt to normal position` a catch and connections between said catch and the rear linkbetween its points of connection to the other link and the barrel for holding said link bythe catch, whereby the rear link is actuated as a lever during the return movement of the Vbarrel to withdraw the breechbolt, an extractor, a magazine, and a carrier actuated by the links and tripping the catch for the return movement of the breech-bolt, substantially as described.v

7'. The combination with alongitudinallymovable barrel, actuated by the recoil of a breech-bolt, links conn ectin g said breech-bolt and barrel, means for returning vsaid barrel to normal position, a member having a pinand-slot connection with the rear link, and mechanism coacting with said member for actuating said links during the return movement of the barrel to withdraw t-he breechbolt and open the breech and to returnA the breech-bolt to normal position, substantially as described. v

S. The combination with a longitudinallymovable barrel, actuated by the recoil of a breech-bolt, links connecting said breech-bolt 4and barrel, means for returning the barrel to position after recoil, mechanism for actuating the links to withdraw the breech-bolt and open the breech and for returning the breechbolt to normal position, and means for transmitting recoil-pressure from the breech-bolt .to the barrel independently of the rear link,

substantially as described.

9. The combination with a longitudinallymovable barrel, actuated by the recoil of a breech-bolt, links connecting said breech-bolt and barrel, means for returning the barrel to position after recoil, mechanism for actuating the links to withdraw the breech-bolt and open the breech and for returning the breech-bolt to normal position, and lugs on the frontlink and barrel engaging during the recoil movement for transmitting the recoil-pressure, substantially as describedf 10. The combination with the longitudinally-movable barrel actuated by the recoil,

breech-bolt, barrel extension G and links a,'

IIO

h connecting 'the breech-bolt and barrel eX- tension, of` lugs on link a and barrel extension G engaging during the recoil movement, substantially as described.

11. The eombinationivith a longit-ndinall'y--` movable barrel, actuatedby the'recoil of a breech-holt, links connecting said'b're'ech-bolt and barrel, means for returning the barrel to position afterrecoil,rmechanism foi-actuating the links during Vthe return-movement of the barrel lto Withdraw the breech-bolt and open l thebr'ecch and'A for returning the-b1'eecl1bolt to lnormal 'position,' `a firing-pin," al hammer cocked bythe recoil, and asafety deviceholdingthefring-pin awayfromrthe 'cartridge lposition, substantially as desci'jibed stantially as described.

unt-il the parts .are fully -retnrlnedr-to,normal d 12. The combinationWitha l recoil-operated cockin g mechanism,

a trigger, and a pivoted member on lthe sear vengaged by the trigger torelease the hammer and rocked by the hammer to'release the scar when the hammer falls, substantially as described. v y

13. The combination W'itlra hammer and recoil-'operatedcooking mechanism, of sear 32 carr in@ ,awl 33 trigger 30 hav-imr ro'ec- D 7 b D,

tion' 9 beneath said pawl when the trigger isk in i'tsnormal'position, and. projection 36 on .tr-he hammer arranged to rock said vpawl off the projection 9 asthe hammer falls, sub- V1l. The combination with a carrier L hav- A ing the spring-wings l, ofthe breech-bolt E having a 'projection separating said wings for the receipt of the cartridgeifrom the magazine, substantially as described 15. ',The'combination ivitlifthe barrel, barrel extension, breech-bolt and links (1,1), and removable part fra-me cfcarrying said members, of breech-actuating mechanism detachably connected to said links and barrel ex-4 tension and means for detachably securing tially as described.

1G. The combination vwith the barrel, bar-V rel extension, breech-bolt, and links a., b, and

removable part frame c' carrying saldmem- 'the parts ofthe gun-frame together, substani bers, said 'link l) having an open slot, of

breech-actuating mechanism 4connected with "said leverlby a'pinentcring said open slot,-

``and means for detachably securing the partsv f the gun-frame together, substantially as described.

1.71 IThe "combina-ti bijeech-boltfand barrel-extension link 'b havin'gslot-:Lflcver 18 having pin entering said scribed.

1.8.: The combination with v:the *lon'gi-tudi-k nally-mo-vable barrel, breech-'bolt F and barrel extension G, ofY linkse, b, connecting the breech-bolt andbarrel-extension link l) having slot-1, leverV l8havin g pin 2 entering said slot, catch-arm 20, carrying rcatch 4: for holding the lever 18, and a carrier having arm 23 engaging said catch-arm 1o trip thecateh,

substantially as described.' i

...-10. The combination 'with the longitudinally-movable barrel, breech-bolt F and barrel extension G, of links d', b, connectingthe 'ing links a, I), connecting the breeeh-boltand barrel-extension and a'carrjer having projections 24,25 engaged by said links to aetnate the carrier, substantially as described. I

` In testimony whereof I haveV hereunto set 'my hand in lthe presence of two subscribing Iwitnesses.v l

Y 'ROBERT M. CAl'ILIN.

\Vitnesses:

E. L. lllcMAHAN, JAs. IMUGHERTY.

n lwim the iongaudinally-movableibarreLbreech-bolt F and bar-' v -rel-extension G', of linkse, Z connecti.ng thc y55 slot, catch` 4' engaging said lever and means f `for tripping said' cat clnfsubsta'ntially as de- 

